Genuine Honda part which means the highest quality. Machined to manually stop at 35 or 40 degree ignition advance. We have this available in both new and used. All used gears are fully inspected , cleaned and reassembled. This gear is mainly used as a manual stop because if you have as small amount of piston to valve clearance sometimes an unmodified 50 degree VTC gear can over shoot if set to stop at 40 degree and cause piston to valve contact.